(select 198766*667891)
    (x-x/1.13*0.1)/7.11=0.0388
    Testing
    Testing
    50=(100+x)*x/[(200+x)*(100-x)]
    x^2=13.8
    x^2=13.8
    x^2
    x^2
    x^2-2x+2
    x^2=13.8
    x^2=13.8
    1000000-5000x-51x²=0
    x²/[(200+x)*(100-x)]=50
    x²/[(200+x)*(100-x)]=50
    x²/[(200+x)*(100-x)]=500
    41*（1+x)^14=1867
    501x²+50000x-10000000=0
    450x-310.02-240x-(450x*0.13-15*-30.4)*0.12=0
    ((X+20)/(1-0.004))*0.004=2000

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